In chemistry, the mole fraction of a component in a mixture is the relative proportion of molecules belonging to the component to those in the mixture, by number of molecules. It is one way of measuring concentration. It provides the most symmetrical way of representing thermodynamicfunctions of mixtures. For each component , the mole fraction is the number of moles divided by the total number of moles in the system, .
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Concentration of a substance in a mixture measured as moles of the substance per mole of mixture. For example, the mole fraction of oxygen in air is about 0.21, which means that 1 mol of air contains about 0.21 mol O2.
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